Minimize casts to pointers #1871

Job	Run time
Format	26s
Check	1m 2s
Build	1m 44s
Check docs	31s
Clippy	1m 17s
Run (x86_64, rusty_demo, none, dev)	4m 26s
Run Hermit for Rust (x86_64 + kvm)	4m 23s
Run (x86_64, rusty_demo, none, release)	3m 24s
Test	1m 32s
Run (x86_64, httpd, virtio-net-pci, dev)	3m 15s
Run (x86_64, httpd, virtio-net-pci, release)	3m 29s
Run (x86_64, httpd, rtl8139, dev)	3m 3s
Run (x86_64, httpd, rtl8139, release)	2m 57s
Run (x86_64, testudp, virtio-net-pci, dev)	2m 45s
Run (x86_64, testudp, virtio-net-pci, release)	2m 49s
Run (x86_64, testudp, rtl8139, dev)	3m 27s
Run (x86_64, testudp, rtl8139, release)	3m 2s
Run (x86_64, hello_world, none, dev)	2m 39s
Run (x86_64, hello_world, none, release)	3m 23s
Run (aarch64, rusty_demo, none, dev)	4m 44s
Run (aarch64, rusty_demo, none, release)	2m 58s
Run (aarch64, httpd, virtio-net-pci, dev)	2m 57s
Run (aarch64, httpd, virtio-net-pci, release)	3m 28s
Run (aarch64, testudp, virtio-net-pci, dev)	3m 52s
Run (aarch64, testudp, virtio-net-pci, release)	3m 10s
	1h 10m 43s

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